Asymmetric fiber link transmission delay measuring method

Abstract

The invention relates to the technical field of optical fiber communication and time frequency synchronization, and especially relates to an asymmetric fiber link transmission delay measuring method. Lengths of uplink and downlink fibers between a master station device and a slave station device are measured by sending light signals in different wavelengths in the uplink and downlink fibers between the master station device and the slave station device; then, time deviation between the master station device and the slave station device is calculated; and the time deviation is corrected and compensated, so that time synchronization between the master station device and the slave station device is realized. The invention provides a new measuring method for the problem that an asymmetric fiber link has transmission delay difference. Through a correction factor method, measurement accuracy of the asymmetric fiber link transmission delay is improved; and IEEE 1588 time synchronization technology is allowed to be applied to a fiber link comprising a light amplifier, thereby solving the measurement problem of fiber link asymmetric transmission delay in an optical communication system.

Description

technical field [0001] The invention relates to the technical field of optical fiber communication and time-frequency synchronization, in particular to the measurement of transmission time delay of an asymmetric optical fiber link. Background technique [0002] At present, in a packet transport network (PTN, Packet Transport Network), the IEEE1588 protocol is generally used to transmit time synchronization signals to each node device in the network, thereby realizing time synchronization of the entire communication network. IEEE 1588 is the main technical means to replace satellite timing systems such as GPS / GLONASS / Beidou satellites to solve the time synchronization problem of communication networks. The full name of the IEEE1588 protocol is "Precision Clock Synchronization Protocol Standard for Network Measurement and Control Systems", which is a precision time protocol (Precision Time Protocol, PTP) for distributed control systems with multipoint communication. Using the...

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Problems solved by technology

[0007] Aiming at the fact that existing test methods cannot be applied to asymmetric optical fiber links with optical amplifiers, the purpose of the present invention is to solve the problem that IEEE 1588 is not applicable to asymmetric optical fiber links, and propose a method for measuring the time delay of asymmetric optical fiber links method, which is also suitable for measuring the time delay of asymmetric fiber links with optical amplifiers

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